Ran into a buddy today while christmas shopping. His cousin lost 3 dogs the other day to a cat. I guess on the way home from a hunt, one ran across the mainline and he let 3 of his 5 dogs out after it, figuring it'd be an easy tree. Dark fell and he came back in the morning as he has done many times, to find one of his dogs dead and the other 2 hurt maimed beyond repair which he had to shoot on the spot. A sad and expensive day for him, as well as a painful night for the dogs. Figures the snow was too deep and they couldn't dodge the swatting cat.
I hunted with him a few years ago and his dogs were very seasoned and he is definitely a veteran cat hunter. Defintely the greatest downfall of cougar hunting and it happens to the best of them.